.{$collapse-prefix}
    &-item
        display block
        &.{$collapse-prefix}-item-active
            .{$collapse-prefix}-item-header
                .{$collapse-prefix}-item-expand
                    transform rotate(90deg)
    &-item-header
        height 40px
        line-height 40px
        border-top 1px solid $gray3-color
        padding 0 10px
        font-size $font-size-mini
        transition all $transition-time
        &:hover
            color $primary-color
            cursor pointer
    &-item-expand
        margin-top 0
        margin-right 5px
        transform rotate(0deg)
        transition all $transition-time
        font-size 12px
    &-item-content
        word-break break-all
    &-item-content-box
        padding 10px 20px

.{$collapse-prefix}-transition
    transition height $animate-time ease-in-out